postgresql: add backup and restore

pkgs/clan-cli/clan_cli/backups/restore.py

@@ -14,9 +14,15 @@ from ..machines.machines import Machine
 def restore_service(machine: Machine, name: str, provider: str, service: str) -> None:
     backup_metadata = json.loads(machine.eval_nix("config.clanCore.backups"))
     backup_folders = json.loads(machine.eval_nix("config.clanCore.state"))
+
+    if service not in backup_folders:
+        msg = f"Service {service} not found in configuration. Available services are: {', '.join(backup_folders.keys())}"
+        raise ClanError(msg)
+
     folders = backup_folders[service]["folders"]
     env = {}
     env["NAME"] = name
+    # FIXME: If we have too many folder this might overflow the stack.
     env["FOLDERS"] = ":".join(set(folders))
 
     if pre_restore := backup_folders[service]["preRestoreCommand"]: